Compute source spans for IR nodes and J/K-elements

pkg/compiler/lib/src/compiler.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.compiler_base;
 
 import 'dart:async' show Future;
 
 import '../compiler_new.dart' as api;
 import 'backend_strategy.dart';
@@ skipping 1122 matching lines @@
         (ex.message != null) ? tryToString(ex.message) : tryToString(ex);
     reportDiagnosticInternal(
         createMessage(ex.node, MessageKind.GENERIC, {'text': message}),
         const <DiagnosticMessage>[],
         api.Diagnostic.CRASH);
   }
 
   /// Using [frontendStrategy] to compute a [SourceSpan] from spannable using
   /// the [currentElement] as context.
   SourceSpan _spanFromStrategy(Spannable spannable) {
-    SourceSpan span =
-        compiler.frontendStrategy.spanFromSpannable(spannable, currentElement);
+    SourceSpan span;
+    if (compiler.phase == Compiler.PHASE_COMPILING) {
+      span =
+          compiler.backendStrategy.spanFromSpannable(spannable, currentElement);
+    } else {
+      span = compiler.frontendStrategy
+          .spanFromSpannable(spannable, currentElement);
+    }
     if (span != null) return span;
     throw 'No error location.';
   }
 
   SourceSpan spanFromSpannable(Spannable spannable) {
     if (spannable == CURRENT_ELEMENT_SPANNABLE) {
       spannable = currentElement;
     } else if (spannable == NO_LOCATION_SPANNABLE) {
       if (currentElement == null) return null;
       spannable = currentElement;
@@ skipping 439 matching lines @@
   _ElementScanner(this.scanner);
   void scanLibrary(LibraryElement library) => scanner.scanLibrary(library);
   void scanUnit(CompilationUnitElement unit) => scanner.scan(unit);
 }
 
 class _EmptyEnvironment implements Environment {
   const _EmptyEnvironment();
 
   String valueOf(String key) => null;
 }